if [ -e 111 ];then
    echo '已存在文件111'
    read -p '输入1删除0忽略' number
    if [ $number == 1 ];then
        rm -rf 111
        mkdir 111new
        echo '删除并建立新文件夹'
    elif [ $number == 0 ];then
        echo '已忽略'
    fi
else
    mkdir 111new-111new
    echo '建立文件夹'
fi